Bettis RPX-Series Rack and Pinion Pneumatic Actuators Owner's manual

Brand: Bettis

Model: RPX-Series Rack and Pinion Pneumatic Actuators

Type: Owner's manual

DOC.IOM.BRX.EN Rev. 2

May 2021

Installation, Operation and Maintenance Manual

Bettis RPX-Series

Rack and Pinion Pneumatic Actuators

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

Notes

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Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Table of Contents

Section 1: Introduction

1.1 General Pneumatic System Recommendations .............................................. 1

1.1.1 Operating Media ................................................................................. 2

Section 2: Construction

2.1 Construction ................................................................................................. 3

2.2 Storage ......................................................................................................... 3

Section 3: Standard Installation

3.1 Buttery Valve Application ............................................................................ 4

3.2 Ball Valve Application .................................................................................... 4

3.3 All Quarter Turn Valve Types .......................................................................... 5

3.4 Non-standard Installation - Double-Acting and Spring-Return Actuators ....... 6

Section 4: Disassembly Procedure

4.1 Double-Acting Actuators ............................................................................... 7

4.2 Single-Acting Actuators ................................................................................ 8

Section 5: Assembly Procedure

5.1 Assembly Double-Acting Actuators ............................................................... 9

5.2 Assembly Spring-Return .............................................................................. 11

5.2.1 FAIL - CLOSE - Clockwise to CLOSE ..................................................... 11

5.2.2 FAIL - OPEN - Counterclockwise to OPEN ........................................... 11

5.2.3 End Cap Bolt Torque Values .............................................................. 12

5.3 Spring Allocation ......................................................................................... 13

5.4 Setting of Internal Travel Stops .................................................................... 14

5.4.1 Double-Acting Actuator ................................................................... 14

5.4.2 Spring-Return Actuator FAIL - CLOSE ................................................. 15

5.4.3 Spring-Return Actuator FAIL - OPEN .................................................. 16

Section 6: Maintenance

6.1 Maintenance ............................................................................................... 17

6.2 Troubleshooting .......................................................................................... 17

6.3 Pneumatic Air Connection ........................................................................... 17

Section 7: Parts and Materials

Parts and Materials ................................................................................................ 18

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

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Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Section 1: Introduction

Introduction

Section 1: Introduction

This Section explains:

• General pneumatic system recommendations

1.1 General Pneumatic System Recommendations

All Bettis RPX Pneumatic Actuators are factory lubricated with Castrol LMM grease,

and unless the operating environment is extremely harsh, do not require relubrication.

For applications where the environmental temperature ranges from -40 °C to +65 °C

(-40 °F to +149 °F), a low temperature version is available with L-NBR O-ring seals and

Cassida Grease LTS 1 grease or Castrol Opti temp TT 1 + TT 1 EP.

For applications where the environmental temperature ranges from -52 °C to +65 °C

(-62 °F to +149 °F), an extreme low temperature version is available with L-NBR O-ring

seals and MolyKote

33 Extreme Low temperature grease.

For applications where the environmental temperature ranges from -15 °C to +150 °C

(+5 °F / +302 °F), a high temperature version is available with FKM O-ring seals and Castrol

Premium Heavy Duty grease.

To maintain maximum efciency with this actuator, we advise that the following basic

system recommendations are followed:

1. For maximum cycle life, the air quality of compressed air should be 2.4.1 as per

ISO 8573-1 standard.

2. Where pipelines are subjected to extremes of temperature, the system should

be tted with suitable air drying equipment.

3. When working at low temperatures, it is important that the compressed air has

been dried to a dew point of less than the ambient temperature. If this is not the

case, water will be condensed from the compressed air and freeze causing damage

to the seals inside the actuator, which could result in actuator failure.

4. Air control lines should be tted in accordance with a “Recommended Piping

Practice” and should not have loops, which may trap condensate.

5. All air connection pipe ends should be thoroughly cleaned and deburred after

cutting, to ensure that the pipeline is clear of debris.

6. If pipelines are hydraulically tested, then the lines should be “blown down” with

pressurized air to clear all traces of water, prior to connecting lines to the actuator.

7. Where pipe tting sealants are used, they should be applied to the male threads

only, to avoid excess compound being forced into the actuator control lines.

8. Where air lter equipment is used, the air lters should be situated in positions

that allow easy access to maintain and/or drain.

9. Where pneumatic valve positioners or pneumatic controllers are tted to the

valve actuator assemblies, oil mist lubricated air should not be used unless

the manufacturer states specically that the controllers are compatible with

lubricated air.

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

Section 1: Introduction

Introduction

1.1.1 Operating Media

1. Use clean, dry or lubricated air or inert gas.

2. Maximum Operating Pressure (MOP) = 8.3 barg / 120 psig.

MOP is the pressure required to produce the maximum rated torque at the break

position for all actuators. Pressure should not exceed MOP during valve rotation.

MOP should be the maximum pressure regulator setting.

!

WARNING

Do not exceed specications. It can be assured that the housing will not rupture or burst

when applying 10 bar / 145 psi of pressure but the cycle function cannot be guaranteed as

it totally depends on the time span to which actuator is subjected at 10 bar / 145 psi and

the frequency at which these pressure peaks occurs. Every time this peak occurs will, for

sure, have a signicantly negative effect on the life expectancy of the actuator.

!

WARNING

For safety reasons, do not “air assist” Single-Acting Pneumatic Actuators.

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DOC.IOM.BRX.EN Rev. 2 May 2021

Section 2: Construction

Construction

Section 2: Construction

This Section explains:

• General construction principles and storage recommendations

2.1 Construction

Bettis RPX Actuators are designed to be mounted to quarter turn valves either directly

or using the correct mounting brackets/adapter and sizing products.

All models are of the opposed piston type. Each piston incorporates an integral rack

which engages with a one piece pinion drive shaft. The drive shaft is Zinc + Nickel plated

for maximum protection. The actuator body is of extruded aluminium, and tted with

“engineered polymer” bearings at the drive shaft locations. Bearing and piston seals are

dynamic “O-ring” type.

The drilling pattern and drive of the actuator valve ange complies to EN ISO 5211.

The drive is by means of a double square (star-drive) and most actuator size have 2 ISO

drilling patterns.

The top mounting interface and solenoid mounting interface complies to the

VDE/VDI 3845 (NAMUR) standard.

Adjustable travel stops are provided for each end of travel to ensure that the actuator

will open and close the valve precisely.

2.2 Storage

All actuators leave the factory tested and in excellent working condition and nish. In order

to maintain these characteristics until the actuator is installed in the plant, it is necessary

to observe the following rules and take appropriate measures during the storage period.

1. Make sure that the transport plugs remain tted in the air connections. These

plastic plugs close the air inlets, but do not have a waterproof function, as they

are a means of protection against the entry of foreign matter during transport.

For long term and specically outdoor storage, these plastic plugs need to be

replaced with plugs providing a complete weatherproof protection.

2. If the actuators are supplied separately from the valves, they must be placed onto a

wooden pallet in order to prevent damaging the valve coupling. For long term out-

door storage it is advised to coat the coupling parts with protective oil or grease.

3. In case of long term storage, it is advised to keep the actuators in a dry place or to

provide some means of weather protection.

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May 2021 DOC.IOM.BRX.EN Rev. 2

Standard Installation

Section 3: Standard Installation

This Section explains how to install the Bettis RPX actuators in most comon applications like:

• "In-line" installation on quarter turn valves.

• "Transverse" (a.k.a. across line) installation on quarter turn valves.

The RPX Actuator can be used for buttery valves, ball valves and all quarter turn devices,

in Double-Acting or Spring-Return conguration. Single-Acting Actuators are supplied

as FAIL - CLOSE (CW) as standard. Reverse acting (FAIL - OPEN; CCW) must be specied at

the time of order. Alternatively, it is possible to change an actuator from FAIL - CLOSE to

FAIL - OPEN by a trained and certied mechanical engineer using the assembly/disassembly

instructions as described in this document.

These installation instructions assume that the actuator is installed with the cylinder axis

parallel to the axis of the valve bore ("In-line" mounting). Please ensure that you have an

actuator with the correct drive, and that the valve and actuator are in the following positions:

1. Double-Acting units and Spring-Return units in FAIL - CLOSE position: valve closed,

actuator fully clockwise.

2. Double-Acting units and Spring-Return units in FAIL - OPEN position: valve open,

actuator fully counterclockwise.

3.1 ButteryValveApplication

Mounting to buttery valves:

1. Screw the actuator mounting studs tightly into the actuator base.

2. Install the correct shaft adapter if required.

3. Mount the actuator onto the valve top ange and secure using a lock washer

and nut on each mounting stud.

3.2 BallValveApplication

Mounting to ball and high performance buttery valves using a bracket:

1. Screw the actuator mounting studs tightly into the actuator base and secure

the mounting bracket to the underside of the actuator using four nuts and

washers as shown in Figure 1.

2. Install the appropriate coupling onto the valve stem. The coupling should

be lightly tapped or pressed onto the valve stem. The use of a lubricant

is recommended.

3. Mount the actuator and bracket onto the valve top ange using the

appropriate bolts.

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DOC.IOM.BRX.EN Rev. 2 May 2021

Standard Installation

Section 3: Standard Installation

3.3 AllQuarter-TurnValveTypes

1. Before installing the valve/actuator assembly in a piping system, the disc

travel should be veried and adjusted if necessary using the travel stop screws

(see Section 5.4, Setting of internal travel stops).

2. When installing the valve/actuator assembly into the pipeline, ensure that the

specic instructions relating to the valve installation are followed.

NOTE:

Some valves may require to be tted into the pipeline prior to mounting the actuator.

Rubber lined buttery valves are an example of this.

3. For valves which need to be installed in the pipeline prior to tting the actuator,

ensure that the valve is operated into its failsafe position before mounting the

actuator onto the valve.

Figure 1 Actuator Mounting

Typical Butterfly valve mounting Typical Ball valve mounting

Pneumatic

actuator

Stud

Lockwasher

Valve

Adaptor

(if required)

Nut

Pneumatic

actuator

Stud

Lockwasher

Nut

Lockwasher

Bracket

(if required)

Bolt

Coupling

(if required)

Nut

Ball valve

Pneumatic

actuator

Pneumatic

actuator

Adaptor

(if required)

Bracket

(if required)

Coupling

(if required)

Bolt

Lockwasher

Nut

Stud

Valve Ball valve

TypicalButteryValveMounting TypicalBallValveMounting

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May 2021 DOC.IOM.BRX.EN Rev. 2

Section 3: Standard Installation

Standard Installation

3.4 Non-standard Installation - Double-Acting and

Spring-Return Actuators

In circumstances where the actuator is required to be installed in the transverse position

i.e. at right angles to the valve bore ("across line" mounting), the actuator must be rotated

through 90°. This is achieved in the following manner.

All quarter turn valve types:

1. Remove the actuator from the valve or the bracket by removing the 4 xing bolts/

nuts, and withdraw it vertically from the valve.

2. Reposition the shaft insert 90° for Double-D connections. Bored-keyed and star

drives do not require this action.

3. Rotate the actuator 90°.

4. Ret the actuator to the top of the valve or to the bracket. Pay attention to the

output drive of the actuator to be in line with the valve shaft and/or shaft insert.

Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Section 4: Disassembly Procedure

Disassembly Procedure

Section 4: Disassembly Procedure

This Section explains:

• How to disassemble an actuator safely.

4.1 Double-Acting Actuators

!

WARNING

Remove air pressure and observe normal safety precautions, including the use of

eye protection.

1. Remove the indicator assembly (25) from the top of the actuator.

2. Remove both travel stop bolts (21), after slackening the lock nuts (23).

3. Verify that the end caps are for Double-Acting actuator (at), and loosen end

cap xing screws evenly (22).

4. Remove the end caps (4).

5. Using a suitable wrench in the top of the pinion shaft (2), turn the shaft counter

clockwise to drive the pistons apart. Remove the pistons (3) complete with back-

ing pads/O-rings, etc.

6. Remove circlip (24) from the bottom bore of the actuator including thrust

washer (13).

7. Protect the actuator bore during pinion disassembly, and tap pinion shaft

downward. The travel stop cam (5) is rmly attached to the pinion and needs

to be released before removing the pinion from the actuator body (1).

8. Remove the pinion, but take care to protect the actuator bore.

9. Remove top and bottom O-rings (16 and 17) from the pinion shaft.

10. Remove top and bottom bearings (10 and 11) from the pinion shaft.

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May 2021 DOC.IOM.BRX.EN Rev. 2

Section 4: Disassembly Procedure

Disassembly Procedure

4.2 Single-Acting Actuators

!

WARNING

Observe safety precautions. Remove air pressure and observe normal safety precautions,

including the use of eye protection. Always ensure that Spring-Return actuators are in

fail safe position before attempting any maintenance. Pay particular attention to this

requirement when manual operators are tted.

1. Remove the indicator assembly (25) from the top of the actuator.

2. Remove both travel stop bolts (21), after slackening the lock nuts.

3. Loosen end cap xing screws evenly (22) until the spring load is relaxed (3 - 5 mm).

!

WARNING

High spring force. If after loosening the screws by 5 mm there is still compression on the

spring pack re-tighten the end cap screws and return the unit to the factory for service.

4. Remove end caps (4) and spring packs. In order to avoid the springs falling out

place the actuator with the end cap on top.

!

WARNING

High spring force. Do not disassemble the precompressed spring packs, as the springs are

under high force.

5. Using a suitable wrench in the top of the pinion shaft (2), turn the shaft counter

clockwise to drive the pistons apart. Remove the pistons (3) complete with

backing pads/O-rings, etc.

6. Remove circlip (24) from the bottom bore of the actuator including thrust

washer (13).

7. Protect the actuator bore during pinion disassembly, and tap pinion shaft

downward. The travel stop cam (5) is rmly attached to the pinion and needs

to be released before removing the pinion from the actuator body.

8. Remove the pinion, but take care to protect the actuator bore.

9. Remove top and bottom O-rings (16 and 17) from the pinion shaft.

10. Remove top and bottom bearings (10 and 11) from the pinion shaft.

Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Section 5: Assembly Procedure

Assembly Procedure

Section 5: Assembly Procedure

This Section explains:

• How to reassemble a complete actuator.

• How to set the stroke adjustment bolts after reassembly.

5.1 Assembly Double-Acting Actuators

1. Clean all disassembled items and replace all items as O-rings, bearings,

and backing pads as provided in the soft good kit.

2. Liberally grease the body bore with the grease specied.

3. Coat all O-rings and seals with the grease specied.

4. Output shaft assembly:

a. Fit the top bearing assembly (10) on the top of the pinion shaft (2)

with the top O-ring (16) uppermost.

b. Fit the bottom bearing assembly (11) on to the bottom of the pinion

shaft with the bottom O-ring (17) at the bottom.

c. Fit the top thrust washer (12).

5. Carefully insert pinion shaft assembly from underside of the actuator.

6. While inserting, t the travel stop cam (5) on top of the pinion shaft from

within the actuator bore and monitor the position of the NAMUR-slot in the

shaft top and the travel stop cam as shown in Figure 2. Finish with a rm push

to ensure full location.

Figure 2 Standard direction of Rotation

NAMUR

slot

Piston guide

Cam

Pinion Body

Piston

O-ring

Stopper bolt

Direction of movement

Gear mark

indication

45°

±2°

Body Piston O-ring

Direction of movement

Gear mark

indication

Stopper bolt

PinionCamPiston guide

NAMUR

slot

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May 2021 DOC.IOM.BRX.EN Rev. 2

Piston

Cam

Pinion

Body Piston guideO-ring

Stopper bolt

Direction of

movement

Gear mark

indication

45°

±2°

NAMUR

slot

Section 5: Assembly Procedure

Assembly Procedure

7. Fit bottom thrust washer (13) and internal circlip (25) to bottom recess of body

to locate the shaft assembly.

8. Fit the O-ring seals (18) on the pistons (3), and grease the rack.

9. Orientate the output shaft at 45° as in Figure 2.

10. Insert pistons completely with backing pads (9) with piston legs on left hand side

of the bore when viewed from the O-ring end of the piston (Figure 2), until racks

engages with the pinion and then push gently inward. The actuator is now in the

fully closed position, and the shaft indication should be at -5° (pointing slightly

to the right).

11. Turn the pinion shaft counterclockwise until it is orientated in line with the major

axis of the actuator body. The shaft is now in the closed position.

12. Insert the right (close) travel stop bolt (21) together with the O-ring (19), washer

(14) and lock nut (23) until the bolt hits the travel stop cam. Tighten the lock nut.

13. Turn the shaft counterclockwise through 90° to bring it in line with the center line

of the actuator bore. The actuator is now in the open position.

14. Insert the left (open) travel stop bolt (21) together with the O-ring (19),

washer (14) and lock nut (23) until the bolt hits the travel stop cam. Tighten

the lock nut. The position of the travel stop bolts need to be veried after valve

assembly and adjusted if required.

15. Fit end cap gaskets (20) to the end caps (4) using a light smear of grease.

16. Fit Double-Acting end caps (at model) to body evenly and tighten the end cap

screws with the recommended torque (Table 1).

17. Fit position indicator assembly (25) to top of the actuator.

18. Operate the actuator to open and close positions using compressed air and note

the actual positions. Adjust the travel stops if required following the routine

described in this document. If the required travel is not achieved, refer to the

troubleshooting guide.

Figure 3 Non-standard direction of rotation

Body O-ring

Direction

of movement

Gear mark

indication

Stopper bolt

Pinion

Cam

Piston Piston guide

NAMUR

slot

Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Section 5: Assembly Procedure

Assembly Procedure

5.2 Assembly Spring-Return

5.2.1 FAIL - CLOSE - Clockwise to CLOSE

1. Follow the steps 1 to 14 of the Double-Acting assembly procedure.

2. For Spring-Return actuators, the following additional actions are required:

a. Turn the pinion (2) clockwise to the close position.

b. Position the actuator vertically with the piston top in a horizontal plane

(make sure that the lower part is placed on a clean surface).

c. Locate the correct number of spring packs (6) in the cavities on the

piston head. For durability, make sure to divide the number of springs

evenly on both sides, with a maximum difference of 1 spring, and use the

conguration as indicated in Figure 4 based on the number of springs.

d. Fit the rst end cap as described in the following description and repeat

the sequence for the other side.

3. Fit end cap gaskets (20) to the end caps (4) using a light smear of grease.

4. Place end cap on top of the spring packs and make sure that the springs are

located in the spring pockets (cavities). Fit end cap to body evenly using end cap

screws (22) and washer (15). Tighten the end cap screws with the recommended

torque (Table 2). Make sure that the springs remain in position during assembly

of the end cap.

5. Fit position indicator (25) to top of the actuator.

6. Operate the actuator to open and close positions using compressed air and note

the actual positions. Adjust the travel stops if required following the routine

described in this document. If the required travel is not achieved, refer to the

troubleshooting guide.

5.2.2 FAIL - OPEN - Counterclockwise to OPEN

1. Follow the steps 1 to 8 of the Double-Acting assembly procedure.

2. Orientate the output shaft at 45° as in Figure 3.

3. Insert pistons completely with backing pads (9) with piston legs on right hand side

of the bore when viewed from the O-ring end of the piston (Figure 5), until racks

engages with the pinion and then push gently inward. The actuator is now in the

fully open position, and the shaft indication should be at 95°.

4. Turn the pinion shaft clockwise until it is orientated in line with the center line

of the actuator bore (90° position). The shaft is now in the open position.

5. Insert the left (open) travel stop bolt (21) together with the O-ring (19), washers

(14) and lock nut (23) until the bolt hits the travel stop cam. Tighten the lock nut.

6. Turn the shaft clockwise to 0° to bring it in line with the major axis of the actuator

body. The actuator is now in the close position.

7. Insert the right (close) travel stop bolt (21) together with the O-ring (19), washer

(14) and lock nut (23) until the bolt hits the travel stop cam. Tighten the lock nut.

The position of the travel stop bolts need to be veried after valve assembly and

adjusted if required.

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May 2021 DOC.IOM.BRX.EN Rev. 2

Section 5: Assembly Procedure

Assembly Procedure

8. For Spring-Return actuators the following additional actions are required:

a. Turn the pinion counterclockwise to the open position.

b. Position the actuator vertically with the piston top in a horizontal plane

(make sure that the lower part is placed on a clean surface).

c. Locate the correct number of springs in the cavities on the piston head.

Use the conguration as indicated in Figure 6 based on the number of

springs. For durability, make sure to divide the number of springs evenly

on both sides, with a maximum difference of 1 spring.

d. Fit the rst end cap as described in the following description and repeat

the sequence for the other side.

9. Fit end gap gaskets (20) to the end caps (4) using a light smear of grease.

10. Place end cap on top of the spring packs, and t end cap to body evenly using

end cap screws (22) and washer (15). Tighten the end cap screws with the

recommended Torque Table. Make sure that the springs remain in position

during assembly of the end cap.

11. Fit position indicator (25) to top of the actuator.

12. Operate the actuator to open and close positions using compressed air and note

the actual positions. Adjust the travel stops if required following the routine

described in this document. If the required travel is not achieved, refer to the

troubleshooting guide.

5.2.3 End Cap Bolt Torque Values

As the end caps are pressurized during normal operation, it’s important to x them

correctly and not damage the threading due to excessive torque. Please use the torque

values as indicated in Table 1.

Table 1. End Cap Bolts Tightening Torque

Actuator size Bolt size

Tightening torque

(Nm)

Tightening torque

(lbf-in)

003 M5 3 27

004 M5 3 27

006 M5 3 27

009 M6 9 80

014 M8 15 133

020 M8 15 133

032 M10 28 248

052 M12 40 354

084 / 085 M12 40 354

140 / 141 M16 110 974

240 M16 110 974

Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

4 springs

5 springs

6 springs

7 springs

9 springs

10 springs

11 springs

12 springs

8 springs

Left

RightLeft

Right

Section 5: Assembly Procedure

Assembly Procedure

5.3 Spring Allocation

In Spring-Return applications, the number of springs used to determine the torque provided

for fail safe applications. For optimal performance, the number of springs used is based on

the valve type used using the RPX Actuator Torque Table (normally closed applications):

• Ball valves: use spring torque level which matches the spring torque at 90° with

the supplied air starting torque at 0°.

• Buttery valves: use spring torque level which matches the spring torque at 0°

with the supplied air torque at 0°.

The number of springs used can vary between 4 and 12 pieces. For durability, make sure to

divide the number of springs evenly on both sides, with a maximum difference of 1 spring,

and use the conguration as indicated in Figure 4 based on the number of springs.

Figure 4 Spring Allocation

Left

5 springs 10 springs

6 springs 11 springs

7 springs 12 springs

8 springs

4 springs 9 springs

LeftRight Right

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

Pinio

O-ring

Piston open adjustment bolt

Plain washer

Spring washer

Actuator

body

Locking nut

Piston close adjustment bolt

Pinion

O-ring

Cam

Plain washer

Spring washer

Actuator

body

Locking nut

Section 5: Assembly Procedure

Assembly Procedure

5.4 SettingofInternalTravelStops

The Bettis RPX-Series Actuator is tted with integral travel stops to enable setting of exact

travel for the valve being operated. These stops allow over and under travel adjustment

of ± 5° on each end.

!

WARNING

Under no circumstances the travel stop bolts should be completely withdrawn from the

actuator while compressed air is being applied.

Travel stop bolts should not be used for manual override actions.

After setting the travel stops, accessories mounted to the top of the actuator must be

re-adjusted accordingly.

5.4.1 Double-Acting Actuator

1. Operate the valve/actuator assembly to the closed position.

2. Remove air supply.

3. Slacken lock nut on the close travel stop (right).

4. Turn the travel stop clockwise to reduce travel or counterclockwise to

increase travel.

5. Re-tighten lock nut.

6. Reconnect air supply and check that the close position is correct. If not,

repeat from instruction 2.

7. Apply air to the open position.

8. Remove air supply.

9. Adjust open travel stop bolt (left) as per instruction 3 to 6 above.

Figure 5 Cam adjustment (standard direction of rotation)

O-ring O-ring

Pinion Pinion

Cam Cam

Actuator

body

Actuator

body

Plain washer Plain washer

Locking nut Locking nut

Piston close adjustment bolt Piston open adjustment bolt

Spring washer Spring washer

Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Pinio

O-ring

Piston open

adjustment bolt

Plain washer

Spring washer

Actuator

body

Locking nut

Piston close

adjustment bolt

Pinion

O-ring

Cam

Plain washer

Spring washer

Actuator

body

Locking nut

Section 5: Assembly Procedure

Assembly Procedure

5.4.2 Spring-Return Actuator FAIL - CLOSE

1. Remove air supply and check actual close position.

2. Apply air to operate the actuator to the open position.

3. Whilst the air supply is maintained, slacken lock nut on the close travel stop (right)

as the close position is now able to be adjusted.

4. Turn the travel stop clockwise to reduce travel or counterclockwise to

increase travel.

5. Re-tighten lock nut.

6. Remove air supply to close the actuator. If correct close position is not achieved

repeat from instruction 2.

7. Apply air to drive the actuator to the open position and check actual open position.

8. Remove air supply so that actuator closes, and the open travel stop bolt (left) can

be adjusted.

9. Adjust open travel stop bolt as per instruction above.

10. Re-tighten lock nut.

11. Apply air and check open position. If correct open position is not achieved, repeat

from instruction 7.

Figure 6 Cam Adjustment (Non-standard direction of rotation)

O-ring O-ring

Pinion Pinion

Cam

Actuator

body

Actuator

body

Plain washer

Spring washer

Locking nut Locking nut

Piston close

adjustment bolt

Piston open

adjustment bolt

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

Assembly Procedure

Section 5: Assembly Procedure

5.4.3 Spring-Return Actuator FAIL - OPEN

1. Remove air supply and check actual open position.

2. Apply air to operate the actuator to the close position.

3. Whilst the air supply is maintained, slacken lock nut on the open travel stop (left)

as the open position is now able to be adjusted.

4. Turn the travel stop clockwise to reduce travel or counterclockwise to increase travel.

5. Re-tighten lock nut.

6. Remove air supply to open the valve. If correct open position is not achieved

repeat from instruction 2.

7. Apply air to operate the actuator to the close position and check actual close position.

8. Remove air supply so that actuator opens, and the close travel stop bolt (right)

can be adjusted.

9. Adjust close travel stop bolt as per instruction above.

10. Re-tighten lock nut.

11. Apply air and check open position. If correct close position is not achieved,

repeat from instruction 7.

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Bettis RPX-Series Rack and Pinion Pneumatic Actuators Owner's manual

Bettis RPX-Series Rack and Pinion Pneumatic Actuators Owner's manual

Bettis RPX-Series Rack and Pinion Pneumatic Actuators Owner's manual

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